Usb Interface; Power Switch; Power_On Button; Rf Switch - SimCom SIM7500 User Manual

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3.4 USB Interface

EVB USB interface (A) actually is USB-to-UART port which could be imaged to two virtual ports.
Figure 5: Virtual serial port
Enhanced COM port: AT communication
Standard COM port: Debug (used for 2G module only)
Notice
CP2105 driver is available here:
http://www.silabs.com/products/mcu/Pages/SoftwareDownloads.aspx

3.5 Power switch

After 5V Adapter is inserted ,switch S201 on, then power LED (D201) will be solid on.

3.6 POWER_ON Button

After giving power to EVB,press the POWER_ON button for more than 1.5 seconds, the module will be
turned on, the network LED light (D401) will blink.

3.7 RF switch

Figure 6: RF switch
SIM7500_EVB Kit_User Guide_V1.01 10 2017-12-12